The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 16, 2014
Filed:
Aug. 30, 2012
Tarun Kumar Bhattacharya, San Jose, CA (US);
David Stevenson Spain, Jr., Portola Valley, CA (US);
Hassan Mohamed El-sallabi, Palo Alto, CA (US);
Robert Lewis Martin, Antioch, CA (US);
Tarun Kumar Bhattacharya, San Jose, CA (US);
David Stevenson Spain, Jr., Portola Valley, CA (US);
Hassan Mohamed El-Sallabi, Palo Alto, CA (US);
Robert Lewis Martin, Antioch, CA (US);
Polaris Wireless, Inc., Mountain View, CA (US);
Abstract
A technique for estimating the location of a wireless terminal at an unknown location in a geographic region is disclosed. The technique is based on the recognition that there are location-dependent traits of electromagnetic signals. In environments where multiple antennas are radiating the same signal, as in the case of distributed antennas or host-repeater configurations, one or more possible locations of the wireless terminal can be designated as improbable based on i) a measure of the propagation delay of a signal traveling between a) a base station and b) the wireless terminal or an infrastructure antenna, or ii) the maximum distance at which a signal is detectable by the wireless terminal. Additionally, the applicable set of values for the location-dependent traits is selected based on similar criteria.